Abstract
The basic connection used in the construction of vehicle bodies is the spot welded connection. On average, there are about 6,000 such connections on the car body. Despite the fact that this type connections have been used at the of vehicle manufacturing stage for many years, it is necessary to control the quality of spot welds in order to achieve high quality, stiffness and durability of the whole car body. There are two groups of methods for assessing the quality of spot welds, which include destructive and non-destructive methods, in particular ultrasonic methods. The article presents se-lected results of ultrasonic inspection of spot welds of vehicle body and verification-using destructive tests. Ultrasound transducer with a water delay line and a frequency of 20 MHz were used. The number of return echoes from the connection area and the RWS parameter were determined. Metallographic examinations of connection area were also made and shear force for connections of different quality (change in welding current intensity) was determined.
Highlights
Resistance spot welded joints are currently most commonly used to connect vehicle body elements
There have been devices that allow to visualize the diameter of the weld nugget [9]
They are based on the ultrasonic method, but allow, unlike a standard flaw detector, to visualize the joint
Summary
Resistance spot welded joints are currently most commonly used to connect vehicle body elements. The systems for assessing the welded connection in real time can be used, which check the quality of each joint on a regular basis during production [7,8]. These systems are based on neural networks and are based on measuring the electrical parameters of the welding process. There have been devices that allow to visualize the diameter of the weld nugget [9] They are based on the ultrasonic method, but allow, unlike a standard flaw detector, to visualize the joint. The main purpose of the tests was the ultrasonic and destructive evaluation of spot welded joints that were made for various parameters of the welding process
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